For anyone needing help, just constantly fly to the left or right keeping your distance, and flying up or down on occasion, dodging when he shoots his laser, and only then using your kamamaya on him whilst he’s shooting his laser and it will knock him on his arse
Switching aint even worth it tbh * Edit * Switching is DEFINITELY worth it, your characters heal and the timing isnt AS bad as it seem after knocking back. The input should be quicker tho
The video is in classic controls. But either way, it's the same. The trick is after pressing square 3 times you stop and open the character switch panel and change characters right after your combo. In the chain they don't show you but they tell you at the bottom that you need to open the panel first.
The main part getting this right is the weird timing after you hit Square 3 or 4 times. I try switching characters after a combo as soon as I can, the game will attack at the end by itself.